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Message-ID:	<001601c11db0$313103f0$0a02a8c0@acceleron>
From:	"Andrew Cottrell" <acottrel AT ihug DOT com DOT au>
To:	"Eli Zaretskii" <eliz AT is DOT elta DOT co DOT il>
Cc:	<djgpp-workers AT delorie DOT com>, "Charles Sandmann" <sandmann AT clio DOT rice DOT edu>
References:	<Pine DOT SUN DOT 3 DOT 91 DOT 1010805154530 DOT 12002B-100000 AT is>
Subject:	Re: Windows 2000 utime query
Date:	Sun, 5 Aug 2001 23:11:45 +1000
MIME-Version:	1.0
X-Priority:	3
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Reply-To:	djgpp-workers AT delorie DOT com

> On Sun, 5 Aug 2001, Andrew Cottrell wrote:
>
> > I have downloaded the touch program from the freedos site and it works
on
> > Win2K. I am in the process of downloading the source files and I hope
the
> > source is in one of them.
>
> It might be that function 5701 fails from protected mode, but not from
> real mode.  (Crazy, I know; but so is the failure itself.)
>
Looks like you are not crazy. I downloaded the FreeDOS touch source code and
it was in assembler, bit it worked. I then downloaded PACIFIC C and wrote a
small test app below for DJGPP and PACIFIC C.  I hope the examples are not
to big, but I thought they may be useful for analysis of the problem. The
app does the same interrupt calls.

Real mode works in Pacific C and protected mode in DJGPP fails. I thought I
was going crazy. The sample works fine on Win 98.

Any suggestions for me to try tmorrow night after work.

Andrew

======================= DJGPP TOUCH.EXE EXAMPLE =======================
DJGPP_204 D:\dj204\contrib\touch>dir new.txt
07/08/2001  11:00p                   4 new.txt

DJGPP_204 D:\dj204\contrib\touch>touch
fildes = 5
dostime (cx)= 0xB80D
dosdate (dx)= 0x2B07
r.x.flags = 0x0002
r.x.ax = 0x5700

NEW dosdate (dx)= 0x2B08
dostime (cx)= 0xB80D
dosdate (dx)= 0x2B08
r.x.flags = 0x0003
r.x.ax = 0x0001

DJGPP_204 D:\dj204\contrib\touch>dir new.txt
07/08/2001  11:00p                   4 new.txt

======================= PACIFIC TOUCH.EXE EXAMPLE =======================
PAC D:\pacific\test>dir new.txt
07/08/2001  10:27p                   6 new.txt

PAC D:\pacific\test>touch
14 filedes = 5
20 dostime (cx) = 0xB378
21 dosdate (dx) = 0x2B07
22 cflag value  = 0x0000
24 return value (ax) = 0x5700
27 dostime (cx) = 0xB378
28 dosdate (dx) = 0x2B08
29 cflag value  = 0x0000
30 return value (ax) = 0x5700
36 dostime (cx) = 0xB378
37 dosdate (dx) = 0x2B08
38 cflag value  = 0x0000
39 return value (ax) = 0x5701

PAC D:\pacific\test>dir new.txt
08/08/2001  10:27p                   6 new.txt

======================= DJGPP TOUCH.C CODE =======================
#include <fcntl.h>
#include <sys/stat.h> /* for mode definitions */
#include <dpmi.h>

static void touchfile(const char *path)
{
  __dpmi_regs r;
  int fildes;

  fildes = open(path, O_RDONLY);
  if (fildes == -1)
  {
     printf("%s %d\n",__FILE__,__LINE__);
     return;
  }

  printf("fildes = %d\n",fildes);

  r.x.ax = 0x5700;
  r.x.bx = fildes;
  __dpmi_int(0x21, &r);

  printf("dostime (cx)= 0x%04X\n", r.x.cx);
  printf("dosdate (dx)= 0x%04X\n", r.x.dx);
  printf("r.x.flags = 0x%04X\n",  r.x.flags);
  printf("r.x.ax = 0x%04X\n\n",  r.x.ax);

  r.x.dx++;
  printf("NEW dosdate (dx)= 0x%04X\n", r.x.dx);

  r.x.ax = 0x5701;
  r.x.bx = fildes; /* File handle */
  __dpmi_int(0x21, &r);

  printf("dostime (cx)= 0x%04X\n", r.x.cx);
  printf("dosdate (dx)= 0x%04X\n", r.x.dx);
  printf("r.x.flags = 0x%04X\n",  r.x.flags);
  printf("r.x.ax = 0x%04X\n",  r.x.ax);

  close(fildes);
  return;
}

int main()
{
    touchfile("new.txt");
    return 0;
}
======================= PACIFIC TOUCH.C CODE =======================
#include <stdio.h>
#include <string.h>
#include <dos.h>
#include <unixio.h>
#include <stat.h>

static void touchfile(register char * filename)
{
    union REGS              regs;
    int filedes;

    filedes = open(filename, S_IREAD);

    printf("%d filedes = %d\n", __LINE__, filedes);

    regs.x.ax = 0x5700;
    regs.x.bx = filedes;
    intdos(&regs, &regs);

    printf("%d dostime (cx) = 0x%04X\n", __LINE__, regs.x.cx);
    printf("%d dosdate (dx) = 0x%04X\n", __LINE__, regs.x.dx);
    printf("%d cflag value  = 0x%04X\n", __LINE__, regs.x.cflag);

    printf("%d return value (ax) = 0x%04X\n", __LINE__, regs.x.ax);

    regs.x.dx++;
    printf("%d dostime (cx) = 0x%04X\n", __LINE__, regs.x.cx);
    printf("%d dosdate (dx) = 0x%04X\n", __LINE__, regs.x.dx);
    printf("%d cflag value  = 0x%04X\n", __LINE__, regs.x.cflag);
    printf("%d return value (ax) = 0x%04X\n", __LINE__, regs.x.ax);

    regs.x.ax = 0x5701;
    regs.x.bx = filedes;
    intdos(&regs, &regs);

    printf("%d dostime (cx) = 0x%04X\n", __LINE__, regs.x.cx);
    printf("%d dosdate (dx) = 0x%04X\n", __LINE__, regs.x.dx);
    printf("%d cflag value  = 0x%04X\n", __LINE__, regs.x.cflag);
    printf("%d return value (ax) = 0x%04X\n", __LINE__, regs.x.ax);

    close(filedes);
}

int main()
{
    touchfile("new.txt");
}

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